BIOS IO Menu Selections
This section includes a screen of the BIOS IO Menu. The options that are available
from the IO Menu are described in the sections that follow.
The following sections describe the BIOS IO Menu options.
BIOS IO Menu PCI Subsystem Settings Options
The following table describes the BIOS IO Menu PCI subsystem settings
options.
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PCI 64 Bit Resources Allocation
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Disabled/Enabled
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Enabled
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Enable or disable 64-bit capable devices to be decoded in
above 4G address space. This setting is available only if the
system supports 64-bit decoding.
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Maximum Payload
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Auto/128 Bytes/256 Bytes/512 Bytes/1024 Bytes/2048 Bytes/4096
Bytes
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Auto
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Set the Maximum Payload of the PCI Express device or allow the
System BIOS to select the value.
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Maximum Read Request
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Auto/128 Bytes/256 Bytes/512 Bytes/1024 Bytes/2048 Bytes/4096
Bytes
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Auto
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Set the Maximum Read Request of the PCI Express device or
allow the System BIOS to select the value.
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PCIe Hot-Plug Support
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Disabled/Enabled
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Enabled
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If enabled, allows the OS to support PCIe Hot-Plug. If
disabled, it does not allow the OS to support PCIe
Hot-Plug.
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BIOS IO Menu IO Virtualization Options
The following table describes the BIOS IO Menu IO virtualization options.
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VT-d
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Disabled/Enabled
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Enabled
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Enable or disable Intel Virtualization Technology for directed
I/O (VT-d) by reporting the I/O device assignment to VMM through
DMA remapping reporting (DMAR) Advance Configuration Power
Interface (ACPI) tables.
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ACS
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Disabled/Enabled
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Disabled
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If disabled, programs ACS only to Chipset PCIe Root Port
Bridges. If enabled, programs ACS to all PCIe Root Port
Bridges.
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SR-IOV Support
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Disabled/Enabled
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Enabled
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Single Root I/O Virtualization (SR-IOV) is used to configure
devices into multiple virtual devices that can be used on
virtual OS installations. If supported by the hardware and set
to enabled, all devices within the system that are SR-IOV
capable are configured to support SR-IOV and I/O resources are
allocated to the device as normal. If set to disabled, I/O
resources are not allocated to the device.
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ARI
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Disabled/Enabled
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Enabled
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If Alternate Routing ID (ARI) is supported by the hardware and
set to enabled, devices are permitted to locate virtual
functions (VFs) in function numbers 8 to 255 of the captured bus
number, instead of normal function numbers 0 to 7.
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BIOS IO Menu IOAT Configuration Options
The following table describes the BIOS IO Menu IOAT configuration options.
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Intel IOAT
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Disabled/Enabled
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Enabled
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Enable or disable Intel IOAT.
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DCA Support
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Disabled/Enabled
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Enabled
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Enable or disable direct cache access (DCA) support.
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BIOS IO Menu Internal Devices Options
The following table describes the BIOS IO Menu internal devices options.
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NET 0
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Displays and provides options to change the internal device
settings.
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PCI-E UEFI Driver Enable
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Disabled/Enabled
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Enabled
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Enable or disable PCI-E UEFI Driver. If set to enabled, UEFI
Driver for the card executes as normal. If set to disabled, UEFI
Driver for the card is not copied into memory and the execution
of the UEFI Driver is inhibited.
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NET 1 through NET 7
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Same description as NET 0
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PCI-E HBA Settings
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Displays and provides options to change PCIe HBA
settings.
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PCI-E HBA Settings
(SideB)
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Displays and provides options to change PCIe HBA
settings.
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BIOS IO Menu Add-in Cards Options
The following table describes the BIOS IO Menu add-in cards options.
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Slot 1
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Displays and provides options to change the settings of the
devices in PCIe HBA slots.
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IO Enable
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Disabled/Enabled
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Enabled
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IO Enable
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PCI-E UEFI Driver Enable
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Disabled/Enabled
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Enabled
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Enable or disable PCI-E UEFI Driver. If set to enabled, UEFI
Driver for the card executes as normal. If set to disabled, UEFI
Driver for the card is not copied into memory and the execution
of the UEFI Driver is inhibited.
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Hot Plug Capable
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Disabled/Enabled
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Enabled
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Specifies if the link is Hot-Plug capable.
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Slot 2 through Slot
16
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Same description as Slot 1.
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